netdev - Re: [PATCH net] Fixes: 5943634fc559 ("ipv4: Maintain redirect and PMTU info in struct rtable again.")

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Date:   Mon, 7 Nov 2016 18:05:33 -0500
From:   Stephen Suryaputra Lin <stephen.suryaputra.lin@...il.com>
To:     netdev@...r.kernel.org
Subject: Re: [PATCH net] Fixes: 5943634fc559 ("ipv4: Maintain redirect and
 PMTU info in struct rtable again.")

I did the temporary clearing/restoring rt_gateway following the deleted
function check_peer_redir(). But, looking again at the function the
assigning of peer->redirect_learned.a4 to rt_gateway can be permanent
because restoring to the old_gw only happens on errors.

I have updated the patch to use __ipv4_neigh_lookup().

Thank you.

On Mon, Nov 07, 2016 at 11:20:16AM -0500, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Mon, 07 Nov 2016 08:08:52 -0800
> 
> > In any case, rt is a shared object at that time, so even temporarily
> > clearing/restoring rt_gateway seems wrong to me.
> > 
> > I would rather call __ipv4_neigh_lookup(dst->dev, new_gw) directly at
> > this point.
> 
> Agreed.